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Journal of Experimental Botany, Vol. 54, No. 380, pp. 131-139, January 1, 2003
© 2003 Oxford University Press

Genomic organization of the Papaver rhoeas self-incompatibility S1 locus

Received 12 June 2002; Accepted 26 July 2002

M. J. Wheeler1,, S. A. Armstrong, V. E. Franklin-Tong and F. C. H. Franklin

Wolfson Laboratory for Plant Molecular Biology, School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

1 To whom correspondence should be addressed. Fax: +44 (0)121 414 5925. E-mail: m.wheeler{at}bham.ac.uk

The self-incompatibility (SI) response in Papaver rhoeas depends upon the cognate interaction between a pollen-expressed receptor and a stigmatically expressed ligand. The genes encoding these components are situated within the S-locus. In order for SI to be maintained, the genes encoded by the S-locus must be co-inherited with no recombination between them. Several hypotheses, including sequence heterogeneity and chromosomal position, have been put forward to explain the maintenance of the S-locus in the SI systems of the Brassicaceae and the Solanaceae. A region of the Papaver rhoeas genome encompassing part of the self-incompatibility S1 locus has been cloned and sequenced. The clone contains the gene encoding the stigmatic component of the response, but does not contain a putative pollen S-gene. The sequence surrounding the S1 gene contains several diverse repetitive DNA elements. As such, the P. rhoeas S-locus bears similarities to the S-loci of other SI systems. An attempt to localize the P. rhoeas S-locus using fluorescence in situ hybridization (FISH) has also been made. The potential relevance of the findings to mechanisms of recombination suppression is discussed.

Key words: FISH, Papaver rhoeas, recombination, retro transposon, self-incompatibility, S-locus.


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